abs-pos-non-replaced-vrl-096.xht (3971B)
1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 2 3 <html xmlns="http://www.w3.org/1999/xhtml"> 4 5 <head> 6 7 <title>CSS Writing Modes Test: absolutely positioned non-replaced element - 'direction: rtl' and 'top', 'height' and 'bottom' are not 'auto' (overconstrained)</title> 8 9 <link rel="author" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/" /> 10 <link rel="help" href="http://www.w3.org/TR/css-writing-modes-3/#vertical-layout" title="7.1 Principles of Layout in Vertical Writing Modes" /> 11 <link rel="help" href="http://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width" title="10.3.7 Absolutely positioned, non-replaced elements" /> 12 <link rel="match" href="abs-pos-non-replaced-vrl-012-ref.xht" /> 13 14 <meta name="flags" content="ahem image" /> 15 <meta name="assert" content="When 'direction' is 'rtl' and 'top', 'height' and 'bottom' are not 'auto' and if the values are overconstrained, then ignore 'top' and solve for 'top'." /> 16 17 <link rel="stylesheet" type="text/css" href="/fonts/ahem.css" /> 18 <style type="text/css"><![CDATA[ 19 html 20 { 21 writing-mode: vertical-rl; 22 } 23 24 div#containing-block 25 { 26 background: red url("support/bg-red-3col-2row-320x320.png"); 27 color: transparent; 28 direction: rtl; 29 font: 80px/1 Ahem; 30 height: 320px; 31 position: relative; 32 width: 320px; 33 } 34 35 div#containing-block > span 36 { 37 background-color: red; 38 bottom: 2em; 39 color: green; 40 height: 1em; 41 margin-bottom: 0em; 42 margin-top: 0em; 43 position: absolute; 44 top: 2em; 45 } 46 47 /* 48 " 49 Layout calculation rules (such as those in CSS2.1, Section 10.3) that apply to the horizontal dimension in horizontal writing modes instead apply to the vertical dimension in vertical writing modes. 50 " 51 7.1 Principles of Layout in Vertical Writing Modes 52 http://www.w3.org/TR/css-writing-modes-3/#vertical-layout 53 54 So here, *-top and *-bottom properties are input into the §10.3.7 algorithms where *-top properties refer to *-left properties in the layout rules and where *-bottom properties refer to *-right properties in the layout rules. 55 56 " 57 If none of the three is 'auto': If both 'margin-left' and 'margin-right' are 'auto', solve the equation under the extra constraint that the two margins get equal values, unless this would make them negative, in which case when direction of the containing block is 'ltr' ('rtl'), set 'margin-left' ('margin-right') to zero and solve for 'margin-right' ('margin-left'). If one of 'margin-left' or 'margin-right' is 'auto', solve the equation for that value. If the values are over-constrained, ignore the value for 'left' (in case the 'direction' property of the containing block is 'rtl') or 'right' (in case 'direction' is 'ltr') and solve for that value. 58 " 59 60 'top' + 'margin-top' + 'border-top-width' + 'padding-top' + 'height' + 'padding-bottom' + 'border-bottom-width' + 'margin-bottom' + 'bottom' = height of containing block 61 62 So: 63 64 160px : top 65 + 66 0px : margin-top 67 + 68 0px : border-top-width 69 + 70 0px : padding-top 71 + 72 80px : height 73 + 74 0px : padding-bottom 75 + 76 0px : border-bottom-width 77 + 78 0px : margin-bottom 79 + 80 160px : bottom 81 ===================== 82 320px : height of containing block 83 84 gives us: 85 86 (solve) : top 87 + 88 0px : margin-top 89 + 90 0px : border-top-width 91 + 92 0px : padding-top 93 + 94 80px : height 95 + 96 0px : padding-bottom 97 + 98 0px : border-bottom-width 99 + 100 0px : margin-bottom 101 + 102 160px : bottom 103 ===================== 104 320px : height of containing block 105 106 And so computed top value must be 80px . 107 */ 108 109 ]]></style> 110 111 </head> 112 113 <body> 114 115 <p><img src="support/pass-cdts-abs-pos-non-replaced.png" width="246" height="36" alt="Image download support must be enabled" /></p> 116 117 <div id="containing-block">1 2 34<span>X</span></div> 118 119 </body> 120 </html>